- CamlQuery with RecursiveAll scope enumerates files across all non-hidden document libraries
- Paginated 500-item batches avoid list view threshold issues
- Files grouped by extension (case-insensitive) with summed size and count
- Results returned as IReadOnlyList<FileTypeMetric> sorted by TotalSizeBytes descending
- Existing CollectStorageAsync, LoadFolderNodeAsync, CollectSubfoldersAsync unchanged
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Add StorageService implementing IStorageService
- Load Folder.StorageMetrics, TimeLastModified, Name, ServerRelativeUrl in one CSOM round-trip per folder
- CollectStorageAsync returns one StorageNode per document library at IndentLevel=0
- With FolderDepth>0, CollectSubfoldersAsync recurses into child folders
- All CSOM calls use ExecuteQueryRetryHelper.ExecuteQueryRetryAsync (3 call sites)
- System/hidden lists skipped (Hidden=true or BaseType != DocumentLibrary)
- Forms/ and _-prefixed system folders skipped during subfolder recursion
- ct.ThrowIfCancellationRequested() called at top of every recursive step
